Convert.ToBase64String 方法

參考

定義

命名空間:: System

組件:: System.Runtime.Extensions.dll

組件:: System.Runtime.dll

組件:: mscorlib.dll

組件:: netstandard.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

將 8 位無符號整數數位的值，轉換為以base-64位數編碼的對等字串表示。

多載

ToBase64String(Byte[])	將8位無符號整數數位轉換為其以base-64位數編碼的對等字串表示。
ToBase64String(Byte[], Base64FormattingOptions)	將8位無符號整數數位轉換為其以base-64位數編碼的對等字串表示。您可以指定是否要在傳回值中插入換行符。
ToBase64String(ReadOnlySpan<Byte>, Base64FormattingOptions)	將指定唯讀範圍內的8位不帶正負號整數，轉換為以base-64位數編碼的對等字串表示。您可以選擇性地指定是否要在傳回值中插入換行符號。
ToBase64String(Byte[], Int32, Int32)	將 8 位無符號整數數位的子集，轉換為以base-64位數編碼的對等字串表示。參數會將子集指定為輸入數位列中的位移，以及陣列中要轉換的項目數目。
ToBase64String(Byte[], Int32, Int32, Base64FormattingOptions)	將 8 位無符號整數數位的子集，轉換為以base-64位數編碼的對等字串表示。參數會將子集指定為輸入數位列中的位移、陣列中要轉換的項目數，以及是否要在傳回值中插入換行符。

ToBase64String(Byte[])

來源:: Convert.cs

來源:: Convert.cs

來源:: Convert.cs

將8位無符號整數數位轉換為其以base-64位數編碼的對等字串表示。

public:
 static System::String ^ ToBase64String(cli::array <System::Byte> ^ inArray);

public static string ToBase64String (byte[] inArray);

static member ToBase64String : byte[] -> string

Public Shared Function ToBase64String (inArray As Byte()) As String

參數

inArray: Byte[]

8 位無符號整數的陣列。

傳回

String

inArray內容的字串表示，以base 64表示。

例外狀況

ArgumentNullException

inArray null。

範例

下列範例會使用 ToBase64String(Byte[]) 方法，將位元組陣列轉換成UUencoded （base-64）字串，然後呼叫 FromBase64String(String) 方法來還原原始位元組陣列。

using System;

public class Example
{
   public static void Main()
   {
       // Define a byte array.
       byte[] bytes = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };
       Console.WriteLine("The byte array: ");
       Console.WriteLine("   {0}\n", BitConverter.ToString(bytes));

       // Convert the array to a base 64 string.
       string s = Convert.ToBase64String(bytes);
       Console.WriteLine("The base 64 string:\n   {0}\n", s);

       // Restore the byte array.
       byte[] newBytes = Convert.FromBase64String(s);
       Console.WriteLine("The restored byte array: ");
       Console.WriteLine("   {0}\n", BitConverter.ToString(newBytes));
   }
}
// The example displays the following output:
//     The byte array:
//        02-04-06-08-0A-0C-0E-10-12-14
//
//     The base 64 string:
//        AgQGCAoMDhASFA==
//
//     The restored byte array:
//        02-04-06-08-0A-0C-0E-10-12-14

open System

// Define a byte array.
let bytes = [| 2uy; 4uy; 6uy; 8uy; 10uy; 12uy; 14uy; 16uy; 18uy; 20uy |]
printfn $"The byte array:\n   {BitConverter.ToString bytes}\n"

// Convert the array to a base 64 string.
let s = Convert.ToBase64String bytes
printfn $"The base 64 string:\n   {s}\n"

// Restore the byte array.
let newBytes = Convert.FromBase64String s
printfn $"The restored byte array:\n   {BitConverter.ToString newBytes}\n"

// The example displays the following output:
//     The byte array:
//        02-04-06-08-0A-0C-0E-10-12-14
//
//     The base 64 string:
//        AgQGCAoMDhASFA==
//
//     The restored byte array:
//        02-04-06-08-0A-0C-0E-10-12-14

Module Example
   Public Sub Main()
       ' Define a byte array.
       Dim bytes As Byte() = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 }
       Console.WriteLine("The byte array: ")
       Console.WriteLine("   {0}", BitConverter.ToString(bytes))
       Console.WriteLine()
       
       ' Convert the array to a base 64 string.
       Dim s As String = Convert.ToBase64String(bytes)
       Console.WriteLine("The base 64 string:{1}   {0}{1}", 
                         s, vbCrLf)
       
       ' Restore the byte array.
       Dim newBytes As Byte() = Convert.FromBase64String(s)
       Console.WriteLine("The restored byte array: ")
       Console.WriteLine("   {0}", BitConverter.ToString(newBytes))
       Console.WriteLine()
   End Sub
End Module
' The example displays the following output:
'     The byte array:
'        02-04-06-08-0A-0C-0E-10-12-14
'     
'     The base 64 string:
'        AgQGCAoMDhASFA==
'     
'     The restored byte array:
'        02-04-06-08-0A-0C-0E-10-12-14

以下是更複雜的範例，可建立 32 位整數的 20 元素陣列。然後，它會使用 BitConverter.GetBytes(Int32) 方法，將每個元素轉換成位元組陣列，它會藉由呼叫 Array.Copy(Array, Int32, Array, Int32, Int32) 方法，將它儲存在緩衝區中適當的位置。接著，這個緩衝區會傳遞至 ToBase64String(Byte[]) 方法，以建立UUencoded （base-64）字串。然後它會呼叫 FromBase64String(String) 方法來譯碼 UUencoded 字元串，並呼叫 BitConverter.ToInt32 方法，將每組四個字節（32 位整數的大小）轉換成整數。範例的輸出會顯示原始數位已成功還原。

using System;

public class Example
{
   public static void Main()
   {
      // Define an array of 20 elements and display it.
      int[] arr = new int[20];
      int value = 1;
      for (int ctr = 0; ctr <= arr.GetUpperBound(0); ctr++) {
         arr[ctr] = value;
         value = value * 2 + 1;
      }
      DisplayArray(arr);

      // Convert the array of integers to a byte array.
      byte[] bytes = new byte[arr.Length * 4];
      for (int ctr = 0; ctr < arr.Length; ctr++) {
         Array.Copy(BitConverter.GetBytes(arr[ctr]), 0,
                    bytes, ctr * 4, 4);
      }

      // Encode the byte array using Base64 encoding
      String base64 = Convert.ToBase64String(bytes);
      Console.WriteLine("The encoded string: ");
      for (int ctr = 0; ctr <= base64.Length / 50; ctr++)
         Console.WriteLine(base64.Substring(ctr * 50,
                                            ctr * 50 + 50 <= base64.Length
                                               ? 50 : base64.Length - ctr * 50));
      Console.WriteLine();

      // Convert the string back to a byte array.
      byte[] newBytes = Convert.FromBase64String(base64);

      // Convert the byte array back to an integer array.
      int[] newArr = new int[newBytes.Length/4];
      for (int ctr = 0; ctr < newBytes.Length / 4; ctr ++)
         newArr[ctr] = BitConverter.ToInt32(newBytes, ctr * 4);

      DisplayArray(newArr);
   }

   private static void DisplayArray(Array arr)
   {
      Console.WriteLine("The array:");
      Console.Write("{ ");
      for (int ctr = 0; ctr < arr.GetUpperBound(0); ctr++) {
         Console.Write("{0}, ", arr.GetValue(ctr));
         if ((ctr + 1) % 10 == 0)
            Console.Write("\n  ");
      }
      Console.WriteLine("{0} {1}", arr.GetValue(arr.GetUpperBound(0)), "}");
      Console.WriteLine();
   }
}
// The example displays the following output:
// The array:
// { 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023,
//   2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575 }
//
// The encoded string:
// AQAAAAMAAAAHAAAADwAAAB8AAAA/AAAAfwAAAP8AAAD/AQAA/w
// MAAP8HAAD/DwAA/x8AAP8/AAD/fwAA//8AAP//AQD//wMA//8H
//
// The array:
// { 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023,
//   2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575 }

open System

let displayArray (arr: 'a[]) =
    printfn "The array:"
    printf "{ "
    for i = 0 to arr.GetUpperBound(0) - 1 do
        printf $"{arr[i]}, "
        if (i + 1) % 10 = 0 then
            printf "\n  "
    printfn $"{arr[arr.GetUpperBound 0]} }}\n"

// Define an array of 20 elements and display it.
let arr = Array.zeroCreate<int> 20
let mutable value = 1
for i = 0 to arr.GetUpperBound 0 do
    arr[i] <- value
    value <- value * 2 + 1
displayArray arr

// Convert the array of integers to a byte array.
let bytes = Array.zeroCreate<byte> (arr.Length * 4)
for i = 0 to arr.Length - 1 do
    Array.Copy(BitConverter.GetBytes(arr[i]), 0, bytes, i * 4, 4)

// Encode the byte array using Base64 encoding
let base64 = Convert.ToBase64String bytes
printfn "The encoded string: "
printfn $"{base64}\n"

// Convert the string back to a byte array.
let newBytes = Convert.FromBase64String base64

// Convert the byte array back to an integer array.
let newArr = Array.zeroCreate<int> (newBytes.Length / 4)
for i = 0 to newBytes.Length / 4 - 1 do
    newArr[i] <- BitConverter.ToInt32(newBytes, i * 4)

displayArray newArr

// The example displays the following output:
// The array:
// { 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023,
//   2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575 }
//
// The encoded string:
// AQAAAAMAAAAHAAAADwAAAB8AAAA/AAAAfwAAAP8AAAD/AQAA/wMAAP8HAAD/DwAA/x8AAP8/AAD/fwAA//8AAP//AQD//wMA//8HAP//DwA=
//
// The array:
// { 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023,
//   2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575 }

Module Example
   Public Sub Main()
      ' Define an array of 20 elements and display it.
      Dim arr(19) As Integer 
      Dim value As Integer = 1
      For ctr As Integer = 0 To arr.GetUpperBound(0)
         arr(ctr) = value
         value = value * 2 + 1
      Next
      DisplayArray(arr)

      ' Convert the array of integers to a byte array.
      Dim bytes(arr.Length * 4 - 1) As Byte 
      For ctr As Integer = 0 To arr.Length - 1
         Array.Copy(BitConverter.GetBytes(arr(ctr)), 0, 
                    bytes, ctr * 4, 4)
      Next
         
      ' Encode the byte array using Base64 encoding
      Dim base64 As String = Convert.ToBase64String(bytes)
      Console.WriteLine("The encoded string: ")
      For ctr As Integer = 0 To base64.Length \ 50 - 1 
         Console.WriteLine(base64.Substring(ctr * 50, 
                                            If(ctr * 50 + 50 <= base64.Length, 
                                               50, base64.Length - ctr * 50)))
      Next
      Console.WriteLine()
      
      ' Convert the string back to a byte array.
      Dim newBytes() As Byte = Convert.FromBase64String(base64)

      ' Convert the byte array back to an integer array.
      Dim newArr(newBytes.Length\4 - 1) As Integer
      For ctr As Integer = 0 To newBytes.Length \ 4 - 1
         newArr(ctr) = BitConverter.ToInt32(newBytes, ctr * 4)
      Next   
      DisplayArray(newArr)
   End Sub

   Private Sub DisplayArray(arr As Array)
      Console.WriteLine("The array:")
      Console.Write("{ ")
      For ctr As Integer = 0 To arr.GetUpperBound(0) - 1
         Console.Write("{0}, ", arr.GetValue(ctr))
         If (ctr + 1) Mod 10 = 0 Then Console.Write("{0}  ", vbCrLf)
      Next
      Console.WriteLine("{0} {1}", arr.GetValue(arr.GetUpperBound(0)), "}")
      Console.WriteLine()
   End Sub
End Module
' The example displays the following output:
'     The array:
'     { 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023,
'       2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575 }
'     
'     The encoded string:
'     AQAAAAMAAAAHAAAADwAAAB8AAAA/AAAAfwAAAP8AAAD/AQAA/w
'     MAAP8HAAD/DwAA/x8AAP8/AAD/fwAA//8AAP//AQD//wMA//8H
'     
'     The array:
'     { 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023,
'       2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575 }

備註

inArray 的項目會視為數值，並轉換成以base-64位數編碼的字串表示法。

以零為遞增順序的基底 64 位數是大寫字元 “A” 到 “Z”、小寫字元 “a” 到 “z”、“數位 ”0“ 到 ”9“，以及符號 ”+“ 和 ”/“。無值字元「=」用於尾端填補。

重要

ToBase64String 方法的設計目的是要處理包含要編碼之所有數據的單一位元組陣列。若要從數據流編碼數據，請使用 System.Security.Cryptography.ToBase64Transform 類別。

一般而言，ToBase64String 方法不會用來往返 UUEncoded （base-64 編碼）字串。也就是說，如果您藉由呼叫 FromBase64String 方法來譯碼字串，則呼叫 ToBase64String 方法來編碼傳回的位元組數位，產生的字元串不一定與原始字串相同。只有在原始字串是有效的base-64編碼字串時，字串才會往返。

另請參閱

適用於

ToBase64String(Byte[], Base64FormattingOptions)

來源:: Convert.cs

來源:: Convert.cs

來源:: Convert.cs

將8位無符號整數數位轉換為其以base-64位數編碼的對等字串表示。您可以指定是否要在傳回值中插入換行符。

public:
 static System::String ^ ToBase64String(cli::array <System::Byte> ^ inArray, Base64FormattingOptions options);

public static string ToBase64String (byte[] inArray, Base64FormattingOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public static string ToBase64String (byte[] inArray, Base64FormattingOptions options);

static member ToBase64String : byte[] * Base64FormattingOptions -> string

[<System.Runtime.InteropServices.ComVisible(false)>]
static member ToBase64String : byte[] * Base64FormattingOptions -> string

Public Shared Function ToBase64String (inArray As Byte(), options As Base64FormattingOptions) As String

參數

inArray: Byte[]

8 位無符號整數的陣列。

options: Base64FormattingOptions

InsertLineBreaks 每 76 個字元插入換行符，或 None 不要插入換行符。

傳回

String

inArray中元素基底 64 的字串表示。

屬性: ComVisibleAttribute

例外狀況

ArgumentNullException

inArray null。

ArgumentException

options 不是有效的 Base64FormattingOptions 值。

範例

下列範例會使用 Base64FormattingOptions.InsertLineBreaks 自變數呼叫 Convert.ToBase64String(Byte[], Base64FormattingOptions)，以在編碼 100 元素位元組陣列所產生的字串中插入換行符。

using System;

public class Example
{
   public static void Main()
   {
       // Define a byte array.
       var bytes = new byte[100];
       int originalTotal = 0;
       for (int ctr = 0; ctr <= bytes.GetUpperBound(0); ctr++) {
          bytes[ctr] = (byte)(ctr + 1);
          originalTotal += bytes[ctr];
       }
       // Display summary information about the array.
       Console.WriteLine("The original byte array:");
       Console.WriteLine("   Total elements: {0}", bytes.Length);
       Console.WriteLine("   Length of String Representation: {0}",
                         BitConverter.ToString(bytes).Length);
       Console.WriteLine("   Sum of elements: {0:N0}", originalTotal);
       Console.WriteLine();

       // Convert the array to a base 64 string.
       string s = Convert.ToBase64String(bytes,
                                         Base64FormattingOptions.InsertLineBreaks);
       Console.WriteLine("The base 64 string:\n   {0}\n", s);

       // Restore the byte array.
       Byte[] newBytes = Convert.FromBase64String(s);
       int newTotal = 0;
       foreach (var newByte in newBytes)
          newTotal += newByte;

       // Display summary information about the restored array.
       Console.WriteLine("   Total elements: {0}", newBytes.Length);
       Console.WriteLine("   Length of String Representation: {0}",
                         BitConverter.ToString(newBytes).Length);
       Console.WriteLine("   Sum of elements: {0:N0}", newTotal);
   }
}
// The example displays the following output:
//   The original byte array:
//      Total elements: 100
//      Length of String Representation: 299
//      Sum of elements: 5,050
//
//   The base 64 string:
//      AQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRobHB0eHyAhIiMkJSYnKCkqKywtLi8wMTIzNDU2Nzg5
//   Ojs8PT4/QEFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaW1xdXl9gYWJjZA==
//
//      Total elements: 100
//      Length of String Representation: 299
//      Sum of elements: 5,050

open System

// Define a byte array.
let bytes = Array.init 100 (fun i -> i + 1 |> byte)
let originalTotal = Array.sumBy int bytes

// Display summary information about the array.
printfn "The original byte array:"
printfn $"   Total elements: {bytes.Length}"
printfn $"   Length of String Representation: {BitConverter.ToString(bytes).Length}"
printfn $"   Sum of elements: {originalTotal:N0}\n"

// Convert the array to a base 64 string.
let s =
    Convert.ToBase64String(bytes, Base64FormattingOptions.InsertLineBreaks)

printfn $"The base 64 string:\n   {s}\n"

// Restore the byte array.
let newBytes = Convert.FromBase64String s
let newTotal = Array.sumBy int newBytes

// Display summary information about the restored array.
printfn $"   Total elements: {newBytes.Length}"
printfn $"   Length of String Representation: {BitConverter.ToString(newBytes).Length}"
printfn $"   Sum of elements: {newTotal:N0}"

// The example displays the following output:
//   The original byte array:
//      Total elements: 100
//      Length of String Representation: 299
//      Sum of elements: 5,050
//
//   The base 64 string:
//      AQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRobHB0eHyAhIiMkJSYnKCkqKywtLi8wMTIzNDU2Nzg5
//   Ojs8PT4/QEFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaW1xdXl9gYWJjZA==
//
//      Total elements: 100
//      Length of String Representation: 299
//      Sum of elements: 5,050

Module Example
   Public Sub Main()
       ' Define a byte array.
       Dim bytes(99) As Byte
       Dim originalTotal As Integer = 0
       For ctr As Integer = 0 To bytes.GetUpperBound(0)
          bytes(ctr) = CByte(ctr + 1)
          originalTotal += bytes(ctr)
       Next
       ' Display summary information about the array.
       Console.WriteLine("The original byte array:")
       Console.WriteLine("   Total elements: {0}", bytes.Length)
       Console.WriteLine("   Length of String Representation: {0}",
                         BitConverter.ToString(bytes).Length)
       Console.WriteLine("   Sum of elements: {0:N0}", originalTotal)                  
       Console.WriteLine()
       
       ' Convert the array to a base 64 string.
       Dim s As String = Convert.ToBase64String(bytes, 
                                               Base64FormattingOptions.InsertLineBreaks)
       Console.WriteLine("The base 64 string:{1}   {0}{1}", 
                         s, vbCrLf)
       
       ' Restore the byte array.
       Dim newBytes() As Byte = Convert.FromBase64String(s)
       Dim newTotal As Integer = 0
       For Each newByte In newBytes
          newTotal += newByte
       Next
       ' Display summary information about the restored array.
       Console.WriteLine("   Total elements: {0}", newBytes.Length)
       Console.WriteLine("   Length of String Representation: {0}",
                         BitConverter.ToString(newBytes).Length)
       Console.WriteLine("   Sum of elements: {0:N0}", newTotal)                  
   End Sub
End Module
' The example displays the following output:
'   The original byte array:
'      Total elements: 100
'      Length of String Representation: 299
'      Sum of elements: 5,050
'   
'   The base 64 string:
'      AQIDBAUGBwgJCgsMDQ4PEBESExQVFhcYGRobHB0eHyAhIiMkJSYnKCkqKywtLi8wMTIzNDU2Nzg5
'   Ojs8PT4/QEFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaW1xdXl9gYWJjZA==
'   
'      Total elements: 100
'      Length of String Representation: 299
'      Sum of elements: 5,050

如範例的輸出所示，Convert.FromBase64String 會成功還原原始位元組陣列;轉換期間會忽略換行符。

備註

inArray 參數的專案會當作數值，並轉換成基底 64 中的字串表示法。

重要

如果 options 參數設定為 InsertLineBreaks，且轉換的輸出長度超過 76 個字元，則會每 76 個字元插入換行符。換行符定義為歸位字元（U+000D），後面接著換行字元（U+000A）。因為換行符在base-64編碼中會被視為空格元，所以在將base-64編碼字串轉換回位元組陣列時會忽略它們。當將編碼字串顯示至控件或控制台視窗等裝置時，換行符就很簡單。如需詳細資訊，請參閱 https://www.rfc-editor.org/的 RFC 2045「多用途因特網郵件延伸模組」。

另請參閱

適用於

ToBase64String(ReadOnlySpan<Byte>, Base64FormattingOptions)

來源:: Convert.cs

來源:: Convert.cs

來源:: Convert.cs

將指定唯讀範圍內的8位不帶正負號整數，轉換為以base-64位數編碼的對等字串表示。您可以選擇性地指定是否要在傳回值中插入換行符號。

public static string ToBase64String (ReadOnlySpan<byte> bytes, Base64FormattingOptions options = System.Base64FormattingOptions.None);

static member ToBase64String : ReadOnlySpan<byte> * Base64FormattingOptions -> string

Public Shared Function ToBase64String (bytes As ReadOnlySpan(Of Byte), Optional options As Base64FormattingOptions = System.Base64FormattingOptions.None) As String

參數

bytes: ReadOnlySpan<Byte>

8 位無符號整數的唯讀範圍。

options: Base64FormattingOptions

其中一個列舉值，指定是否要在傳回值中插入換行符。預設值為 None。

傳回

String

bytes中元素基底 64 的字串表示。如果 bytes 的長度為 0，則會傳回空字串。

例外狀況

ArgumentException

options 不是有效的 Base64FormattingOptions 值。

OutOfMemoryException

輸出長度大於 Int32.MaxValue。

適用於

ToBase64String(Byte[], Int32, Int32)

來源:: Convert.cs

來源:: Convert.cs

來源:: Convert.cs

將 8 位無符號整數數位的子集，轉換為以base-64位數編碼的對等字串表示。參數會將子集指定為輸入數位列中的位移，以及陣列中要轉換的項目數目。

public:
 static System::String ^ ToBase64String(cli::array <System::Byte> ^ inArray, int offset, int length);

public static string ToBase64String (byte[] inArray, int offset, int length);

static member ToBase64String : byte[] * int * int -> string

Public Shared Function ToBase64String (inArray As Byte(), offset As Integer, length As Integer) As String

參數

inArray: Byte[]

8 位無符號整數的陣列。

offset: Int32

inArray中的位移。

length: Int32

要轉換的 inArray 項目數目。

傳回

String

以 inArraylength 專案基底 64 的字串表示，從位置 offset開始。

例外狀況

ArgumentNullException

inArray null。

ArgumentOutOfRangeException

offset 或 length 為負數。

-或-

offset 加上 length 大於 inArray長度。

備註

inArray 的元素會視為數值，並轉換成基底 64 中的字串表示法。

offset 和 length 參數是32位帶正負號的數位。 offset 參數是以零起始。

重要

另請參閱

適用於

ToBase64String(Byte[], Int32, Int32, Base64FormattingOptions)

來源:: Convert.cs

來源:: Convert.cs

來源:: Convert.cs

將 8 位無符號整數數位的子集，轉換為以base-64位數編碼的對等字串表示。參數會將子集指定為輸入數位列中的位移、陣列中要轉換的項目數，以及是否要在傳回值中插入換行符。

public:
 static System::String ^ ToBase64String(cli::array <System::Byte> ^ inArray, int offset, int length, Base64FormattingOptions options);

public static string ToBase64String (byte[] inArray, int offset, int length, Base64FormattingOptions options);

[System.Runtime.InteropServices.ComVisible(false)]
public static string ToBase64String (byte[] inArray, int offset, int length, Base64FormattingOptions options);

static member ToBase64String : byte[] * int * int * Base64FormattingOptions -> string

[<System.Runtime.InteropServices.ComVisible(false)>]
static member ToBase64String : byte[] * int * int * Base64FormattingOptions -> string

Public Shared Function ToBase64String (inArray As Byte(), offset As Integer, length As Integer, options As Base64FormattingOptions) As String

參數

inArray: Byte[]

8 位無符號整數的陣列。

offset: Int32

inArray中的位移。

length: Int32

要轉換的 inArray 項目數目。

options: Base64FormattingOptions

InsertLineBreaks 每 76 個字元插入換行符，或 None 不要插入換行符。

傳回

String

以 inArraylength 專案基底 64 的字串表示，從位置 offset開始。

屬性: ComVisibleAttribute

例外狀況

ArgumentNullException

inArray null。

ArgumentOutOfRangeException

offset 或 length 為負數。

-或-

offset 加上 length 大於 inArray長度。

ArgumentException

options 不是有效的 Base64FormattingOptions 值。

範例

下列範例示範 ToBase64String 方法。輸入分成三個字節（24 位）的群組。因此，每個群組都包含四個 6 位數位，其中每個數位的範圍從十進位 0 到 63。在此範例中，有85個3位元組群組，其餘一個字節。第一個群組包含十六進位值 00、01 和 02，這會產生四個等於十進位 0、0、4 和 2 的 6 位值。這四個值會對應到輸出開頭的基底 64 位數 “A”、“A”、“E” 和 “C”。

如果 3 位元組群組的整數數目不存在，則剩餘的位元組會以零有效填補，形成完整的群組。在此範例中，最後一個字節的值是十六進位 FF。前 6 個位等於 decimal 63，其對應至輸出結尾的 base-64 digit “/”，而接下來 2 個位會填補零，以產生十進位 48，其對應至 base-64 digit “w”。最後兩個 6 位值會填補，並對應至無值填補字元 “=”。

// This example demonstrates the Convert.ToBase64String() and 
//                               Convert.FromBase64String() methods
using namespace System;
bool ArraysAreEqual( array<Byte>^a1, array<Byte>^a2 );
int main()
{
   array<Byte>^inArray = gcnew array<Byte>(256);
   array<Byte>^outArray = gcnew array<Byte>(256);
   String^ s2;
   String^ s3;
   String^ step1 = "1) The input is a byte array (inArray) of arbitrary data.";
   String^ step2 = "2) Convert a subarray of the input data array to a base 64 string.";
   String^ step3 = "3) Convert the entire input data array to a base 64 string.";
   String^ step4 = "4) The two methods in steps 2 and 3 produce the same result: {0}";
   String^ step5 = "5) Convert the base 64 string to an output byte array (outArray).";
   String^ step6 = "6) The input and output arrays, inArray and outArray, are equal: {0}";
   int x;
   String^ nl = Environment::NewLine;
   String^ ruler1a = "         1         2         3         4";
   String^ ruler2a = "1234567890123456789012345678901234567890";
   String^ ruler3a = "----+----+----+----+----+----+----+----+";
   String^ ruler1b = "         5         6         7      ";
   String^ ruler2b = "123456789012345678901234567890123456";
   String^ ruler3b = "----+----+----+----+----+----+----+-";
   String^ ruler = String::Concat( ruler1a, ruler1b, nl, ruler2a, ruler2b, nl, ruler3a, ruler3b, nl );
   
   // 1) Display an arbitrary array of input data (inArray). The data could be 
   //    derived from user input, a file, an algorithm, etc.
   Console::WriteLine( step1 );
   Console::WriteLine();
   for ( x = 0; x < inArray->Length; x++ )
   {
      inArray[ x ] = (Byte)x;
      Console::Write( "{0:X2} ", inArray[ x ] );
      if ( ((x + 1) % 20) == 0 )
            Console::WriteLine();

   }
   Console::Write( "{0}{0}", nl );
   
   // 2) Convert a subarray of the input data to a base64 string. In this case, 
   //    the subarray is the entire input data array. New lines (CRLF) are inserted.
   Console::WriteLine( step2 );
   s2 = Convert::ToBase64String( inArray, 0, inArray->Length, Base64FormattingOptions::InsertLineBreaks );
   Console::WriteLine( "{0}{1}{2}{3}", nl, ruler, s2, nl );
   
   // 3) Convert the input data to a base64 string. In this case, the entire 
   //    input data array is converted by default. New lines (CRLF) are inserted.
   Console::WriteLine( step3 );
   s3 = Convert::ToBase64String( inArray, Base64FormattingOptions::InsertLineBreaks );
   
   // 4) Test whether the methods in steps 2 and 3 produce the same result.
   Console::WriteLine( step4, s2->Equals( s3 ) );
   
   // 5) Convert the base 64 string to an output array (outArray).
   Console::WriteLine( step5 );
   outArray = Convert::FromBase64String( s2 );
   
   // 6) Is outArray equal to inArray?
   Console::WriteLine( step6, ArraysAreEqual( inArray, outArray ) );
}

bool ArraysAreEqual( array<Byte>^a1, array<Byte>^a2 )
{
   if ( a1->Length != a2->Length )
      return false;

   for ( int i = 0; i < a1->Length; i++ )
      if ( a1[ i ] != a2[ i ] )
            return false;

   return true;
}

/*
This example produces the following results:

1) The input is a byte array (inArray) of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert a subarray of the input data array to a base 64 string.

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the entire input data array to a base 64 string.
4) The two methods in steps 2 and 3 produce the same result: True
5) Convert the base 64 string to an output byte array (outArray).
6) The input and output arrays, inArray and outArray, are equal: True

*/

// This example demonstrates the Convert.ToBase64String() and
//                               Convert.FromBase64String() methods

using System;
class Sample
{
    public static void Main()
    {
    byte[] inArray  = new byte[256];
    byte[] outArray = new byte[256];
    string s2;
    string s3;
    string step1 = "1) The input is a byte array (inArray) of arbitrary data.";
    string step2 = "2) Convert a subarray of the input data array to a base 64 string.";
    string step3 = "3) Convert the entire input data array to a base 64 string.";
    string step4 = "4) The two methods in steps 2 and 3 produce the same result: {0}";
    string step5 = "5) Convert the base 64 string to an output byte array (outArray).";
    string step6 = "6) The input and output arrays, inArray and outArray, are equal: {0}";
    int x;
    string nl = Environment.NewLine;
    string ruler1a = "         1         2         3         4";
    string ruler2a = "1234567890123456789012345678901234567890";
    string ruler3a = "----+----+----+----+----+----+----+----+";
    string ruler1b = "         5         6         7      ";
    string ruler2b = "123456789012345678901234567890123456";
    string ruler3b = "----+----+----+----+----+----+----+-";
    string ruler   = String.Concat(ruler1a, ruler1b, nl,
                                   ruler2a, ruler2b, nl,
                                   ruler3a, ruler3b, nl);

// 1) Display an arbitrary array of input data (inArray). The data could be
//    derived from user input, a file, an algorithm, etc.

    Console.WriteLine(step1);
    Console.WriteLine();
    for (x = 0; x < inArray.Length; x++)
        {
        inArray[x] = (byte)x;
        Console.Write("{0:X2} ", inArray[x]);
        if (((x+1)%20) == 0) Console.WriteLine();
        }
    Console.Write("{0}{0}", nl);

// 2) Convert a subarray of the input data to a base64 string. In this case,
//    the subarray is the entire input data array. New lines (CRLF) are inserted.

    Console.WriteLine(step2);
    s2 = Convert.ToBase64String(inArray, 0, inArray.Length,
                                Base64FormattingOptions.InsertLineBreaks);
    Console.WriteLine("{0}{1}{2}{3}", nl, ruler, s2, nl);

// 3) Convert the input data to a base64 string. In this case, the entire
//    input data array is converted by default. New lines (CRLF) are inserted.

    Console.WriteLine(step3);
    s3 = Convert.ToBase64String(inArray, Base64FormattingOptions.InsertLineBreaks);

// 4) Test whether the methods in steps 2 and 3 produce the same result.
    Console.WriteLine(step4, s2.Equals(s3));

// 5) Convert the base 64 string to an output array (outArray).
    Console.WriteLine(step5);
    outArray = Convert.FromBase64String(s2);

// 6) Is outArray equal to inArray?
   Console.WriteLine(step6, ArraysAreEqual(inArray, outArray));
   }

    public static bool ArraysAreEqual(byte[] a1, byte[] a2)
    {
    if (a1.Length != a2.Length) return false;
    for (int i = 0; i < a1.Length; i++)
        if (a1[i] != a2[i]) return false;
    return true;
    }
}
/*
This example produces the following results:

1) The input is a byte array (inArray) of arbitrary data.

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF

2) Convert a subarray of the input data array to a base 64 string.

         1         2         3         4         5         6         7
1234567890123456789012345678901234567890123456789012345678901234567890123456
----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==

3) Convert the entire input data array to a base 64 string.
4) The two methods in steps 2 and 3 produce the same result: True
5) Convert the base 64 string to an output byte array (outArray).
6) The input and output arrays, inArray and outArray, are equal: True

*/

// This example demonstrates the Convert.ToBase64String() and
//                               Convert.FromBase64String() methods
open System

let arraysAreEqual (a1: byte[]) (a2: byte[]) =
    a1.Length = a2.Length &&
    Array.forall2 (=) a1 a2

let step1 = "1) The input is a byte array (inArray) of arbitrary data."
let step2 = "2) Convert a subarray of the input data array to a base 64 string."
let step3 = "3) Convert the entire input data array to a base 64 string."
let step4 = "4) The two methods in steps 2 and 3 produce the same result: {0}"
let step5 = "5) Convert the base 64 string to an output byte array (outArray)."
let step6 = "6) The input and output arrays, inArray and outArray, are equal: {0}"
let nl = Environment.NewLine

let ruler =
    $"         1         2         3         4         5         6         7      {nl}" +
    $"1234567890123456789012345678901234567890123456789012345678901234567890123456{nl}" +
    $"----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-{nl}"

// 1) Display an arbitrary array of input data (inArray). The data could be
//    derived from user input, a file, an algorithm, etc.

printfn $"{step1}\n"

let inArray = 
    [| for i = 0 to 255 do
         printf $"{i:X2} "
         if (i + 1) % 20 = 0 then 
             printfn ""
         byte i |]
printf $"{nl}{nl}"

// 2) Convert a subarray of the input data to a base64 string. In this case,
//    the subarray is the entire input data array. New lines (CRLF) are inserted.

printfn $"{step2}"
let s2 = Convert.ToBase64String(inArray, 0, inArray.Length, Base64FormattingOptions.InsertLineBreaks)
printfn $"{nl}{ruler}{s2}{nl}"

// 3) Convert the input data to a base64 string. In this case, the entire
//    input data array is converted by default. New lines (CRLF) are inserted.

printfn $"{step3}"
let s3 = Convert.ToBase64String(inArray, Base64FormattingOptions.InsertLineBreaks)

// 4) Test whether the methods in steps 2 and 3 produce the same result.
printfn $"{step4} {s2.Equals s3}"

// 5) Convert the base 64 string to an output array (outArray).
printfn $"{step5}"
let outArray = Convert.FromBase64String s2

// 6) Is outArray equal to inArray?
printfn $"{step6} {arraysAreEqual inArray outArray}"

    
// This example produces the following results:
//     1) The input is a byte array (inArray) of arbitrary data.
//
//     00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
//     14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
//     28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
//     3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
//     50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
//     64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
//     78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
//     8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
//     A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
//     B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
//     C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
//     DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
//     F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF
//
//     2) Convert a subarray of the input data array to a base 64 string.
//
//              1         2         3         4         5         6         7
//     1234567890123456789012345678901234567890123456789012345678901234567890123456
//     ----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
//     AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
//     OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
//     cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
//     q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
//     5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w=
//
//     3) Convert the entire input data array to a base 64 string.
//     4) The two methods in steps 2 and 3 produce the same result: True
//     5) Convert the base 64 string to an output byte array (outArray).
//     6) The input and output arrays, inArray and outArray, are equal: True

' This example demonstrates the Convert.ToBase64String() and 
'                               Convert.FromBase64String() methods
Class Sample
   Public Shared Sub Main()
      Dim inArray(255)  As Byte
      Dim outArray(255) As Byte
      Dim s2 As String
      Dim s3 As String
      Dim step1 As String = "1) The input is a byte array (inArray) of arbitrary data."
      Dim step2 As String = "2) Convert a subarray of the input data array to a base 64 string."
      Dim step3 As String = "3) Convert the entire input data array to a base 64 string."
      Dim step4 As String = "4) The two methods in steps 2 and 3 produce the same result: {0}"
      Dim step5 As String = "5) Convert the base 64 string to an output byte array (outArray)."
      Dim step6 As String = "6) The input and output arrays, inArray and outArray, are equal: {0}"
      Dim x As Integer
      Dim nl As String = Environment.NewLine
      Dim ruler1a As String = "         1         2         3         4"
      Dim ruler2a As String = "1234567890123456789012345678901234567890"
      Dim ruler3a As String = "----+----+----+----+----+----+----+----+"
      Dim ruler1b As String = "         5         6         7      "
      Dim ruler2b As String = "123456789012345678901234567890123456"
      Dim ruler3b As String = "----+----+----+----+----+----+----+-"
      Dim ruler As String = [String].Concat(ruler1a, ruler1b, nl, ruler2a, ruler2b, nl, ruler3a, ruler3b, nl)
      
      ' 1) Display an arbitrary array of input data (inArray). The data could be 
      '    derived from user input, a file, an algorithm, etc.
      Console.WriteLine(step1)
      Console.WriteLine()
      For x = 0 To inArray.Length - 1
         inArray(x) = CByte(x)
         Console.Write("{0:X2} ", inArray(x))
         If (x + 1) Mod 20 = 0 Then
            Console.WriteLine()
         End If
      Next x
      Console.Write("{0}{0}", nl)
      
      ' 2) Convert a subarray of the input data to a base64 string. In this case, 
      '    the subarray is the entire input data array. New lines (CRLF) are inserted.
      Console.WriteLine(step2)
      s2 = Convert.ToBase64String(inArray, 0, inArray.Length, _
                                  Base64FormattingOptions.InsertLineBreaks)
      Console.WriteLine("{0}{1}{2}{3}", nl, ruler, s2, nl)
      
      ' 3) Convert the input data to a base64 string. In this case, the entire 
      '    input data array is converted by default. New lines (CRLF) are inserted.
      Console.WriteLine(step3)
      s3 = Convert.ToBase64String(inArray, Base64FormattingOptions.InsertLineBreaks)
      
      ' 4) Test whether the methods in steps 2 and 3 produce the same result.
      Console.WriteLine(step4, s2.Equals(s3))
      
      ' 5) Convert the base 64 string to an output array (outArray).
      Console.WriteLine(step5)
      outArray = Convert.FromBase64String(s2)
      
      ' 6) Is outArray equal to inArray?
      Console.WriteLine(step6, ArraysAreEqual(inArray, outArray))
   End Sub
   
   
   Public Shared Function ArraysAreEqual(a1() As Byte, a2() As Byte) As Boolean
      If a1.Length <> a2.Length Then
         Return False
      End If
      Dim i As Integer
      For i = 0 To a1.Length - 1
         If a1(i) <> a2(i) Then
            Return False
         End If
      Next i
      Return True
   End Function 'ArraysAreEqual
End Class
'
'This example produces the following results:
'
'1) The input is a byte array (inArray) of arbitrary data.
'
'00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
'14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
'28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B
'3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
'50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63
'64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77
'78 79 7A 7B 7C 7D 7E 7F 80 81 82 83 84 85 86 87 88 89 8A 8B
'8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F
'A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3
'B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7
'C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB
'DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF
'F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF
'
'2) Convert a subarray of the input data array to a base 64 string.
'
'         1         2         3         4         5         6         7
'1234567890123456789012345678901234567890123456789012345678901234567890123456
'----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+-
'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4
'OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3Bx
'cnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmq
'q6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj
'5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==
'
'3) Convert the entire input data array to a base 64 string.
'4) The two methods in steps 2 and 3 produce the same result: True
'5) Convert the base 64 string to an output byte array (outArray).
'6) The input and output arrays, inArray and outArray, are equal: True
'

備註

inArray 參數的專案會當作數值，並轉換成基底 64 中的字串表示法。

offset 和 length 參數是32位帶正負號的數位。 offset 參數是以零起始。

重要

如果 options 參數設定為 InsertLineBreaks，且轉換的輸出長度超過 76 個字元，則會每 76 個字元插入換行符。換行符定義為歸位字元（U+000D），後面接著換行字元（U+000A）。如需詳細資訊，請參閱 https://www.rfc-editor.org/的 RFC 2045「多用途因特網郵件延伸模組」。

另請參閱

適用於

共用方式為

Convert.ToBase64String 方法

定義

多載

ToBase64String(Byte[])

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

ToBase64String(Byte[], Base64FormattingOptions)

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

ToBase64String(ReadOnlySpan<Byte>, Base64FormattingOptions)

參數

傳回

例外狀況

適用於

ToBase64String(Byte[], Int32, Int32)

參數

傳回

例外狀況

備註

另請參閱

適用於

ToBase64String(Byte[], Int32, Int32, Base64FormattingOptions)

參數

傳回

例外狀況

範例

備註

另請參閱

適用於

其他資源